Power-transmission mechanism.



H. B. ROSS.

POWER TRANSMISSION MECHANISM. APPLICATION FILED AUG. 7, 1912. RENEWEDJULY18,1913.

ji mwfim m Patented Feb. 17, 1914 34 O mm in? 5! o w W if WITNESSES.l/VVE/V TOR SPENT l l l@E,

fEtj iltRY IBEAUREGAR-D ROSS, F DENVER, COLORADO, ASSIGN'OR TO THE ROSS"lRANEMISSIGN GEAR, COMPANY, OF DENVER, COLORADO, A CORPORATION OFCOLORADO.

PO'WLER-TRANQMISSION MECHANISM.

Specification of Letters Patent.

Patented Feb. 1. Z 191-1.

original application filed May 17, 1912, Serial No. 637,862. Divided andthis application filed August 7, 193.2, Serial No. 713,799.Renewedliluly 18, 1913. Serial No. 779,873.

To aid whom it may concern:

Be it; known that I, HARRY BEAUREGARD Ross, a citizen of the llnitedStates, residing at Denver, county of Denver, and State of Colorado,have invented certain new and.

useful ll'nprovcments in Power llransmission ldechanism, of which thefollowing is a specification.

My invention relates to improvements in power transmission. mechanismand has par ticular reference to tl it type oi? transmission mechanismin which a single or master gear cooperates with a pyramid or series ofalternately arranged concentric and eccen' trio speedmhanging gears.

This invention is a modification 0t anda divisional part of theinvention disclosed in my eopendii'ig application, Serial No.

(397,862, tiled irlay 17, 1912.

The general objecn of my invention to provide an improved means oiholding the single or master gear in working engagement, with theeol'icentrie gears and in en- "eiz'icnt with the eccentric gears whenthe master gear is shifted rom one concentric gear to another.

It further objectof my invention is to provide mechanism whcrewith thesingle or master gear can e supported in working engagement, with theconcentric gears of a series of change speed gears in a rigid manner,and wherewith the friction incident to the operation oi: the mechanismmay be greatly dimunshed.

My invention mnsists generally in a transn'iission mechanism comprisinga shaft carrying a plurality of alternately arranged concentric andeccentric gears, another shat't carryimg or (filll'lQtl with a single ormaster gear, spaced eccentric cams on the shaft earr ing the concentricand eccentric gears for movii'm the master gear torard the shaft, andother means separate from the gear. shaft for holding the, master gearin workihg engagement. with the concentric gears.

My invention consists further in transmission mechanism comprising ashaft earl'ying a plurality of alternately arranged ctincentrie andeccentric gears and 'S]')ace(l eccentric cams, another shaft carrying a,mziist'er gear or cooperation with the con-- centri and eccentricgroan-i, mechanism arranged to engage the eccentric cams for movingthemaster gear toward the plurality of gears, means for shiftingthemaster gear moving mechanism longitudinally, and means spaced from thegear-carrying shaft tor supporting said mechanism to hold the mastergear in working engagement with the aforementioned concentric gears.

My invention consists further in the unique arrangement, construction,and combination of parts whereby these objects named above and otherswhich will appear hereinafter are attained.

My invention will be more readily understood by reference to theaccompanying drawings, which illustrate one "form there of. and inwhich:

lligure 1 is a View of my transmission mechanism embodying my inrention,certain of the parts being removed better to disclose the interioroperating parts; Pig. 2 is a cross section taken substantially on theline 22 of Fig. 1; and Fig. 3 a detail section on the line 3 3 ot Fig.1.

For certain purposes it is desirable positively to support the masterother than the rot atiue' cams up n the shaft. carrying the pyramid ofgears. Such a constrln-tion :turnishes a simpler mechanism in somerespects and also eliminates the friction due to engagement ol? themaster gear supporting mechanism with constantly rotating cams and alsosupplies a more rigid support therefor. I shall now describe my uniquemcchanisl'n for accomplishingthis result.

Referring now to the di'a/wings,-l represents the transmissioneasing orframe in which a shaft 2 is rotatably mounted in suitable bearings Qlt.This shattmay be driven either directly or indirectly from y the sourceol power. Arranged in another 1 part ol the casing a shaft 8, which ismounted in bearing slots ll; in the frame 1,, and it is connected by auniversal joint 5 with the shalt 11 leading to the driving axle or jackshali't (not shown). ()n the shaft. 2 I arrange a number of spaced('roneentrie gears 20, 1,8), and 18, to rotate therewith. and bet weenthem I place concentric gen rs '22 and Adjacent, to the shaft 2 isl'erevcrsing gear 23. ()n. the shaft, 8 L arrai'lg'c a master v ear 1'?for longitudinal movement thereon, j for engagement; with the gearsonthe shaft gear by means 2, and also the reversing gear 23. The

speed of the shaft 8 obviously is determined erly holding it in such.position. For this purpose I afiiX spacedeccentric camsor disks 29 and30 on the shaft 2, the purpose of which is to keep the gear 17 inengagement withthe eccentric gears 22 and 21 in the carrying the gear17.

transition of the master gear from one concentric gear to another. Forshifting the gear 17 longitudinally, I provide a shaft 36 which islongitudinally movable in bearings 37; and which can be moved in eitherdirection by means of a lever 49, and on the shaft 36 I mount mechanismwhereby move ment of the shaft-36 will .at the desired time shift thegear 17 longitudinally. This mechanism obviously may assume variousforms, but I prefer to provide a bell-cranklike member 38 having abifurcated end forming arms, 40, and a single arm portion 39 forengagement with the eccentric earns 29 and 30. Between the arms 40, theshift ing rod 36 is slotted or grooved, as shown at 4:2, and collars 43are provided which may shift along the rod 36 within the limits of theslots 42. Pins 44 carried by the collars 43' enter the slots and serveto limit the movement. Between the collars 43 I arrange a compressionspring 45, and it is by means of this spring that the desired force isapplied to shift the member38 and the gear 17 therewith, as will bepointed out more fully. This method of shifting the gear is merely oneexample of a convenient way to impart motion to the gear and I do not,of course, limit myself to that particular mechanism. Between the arms40 I arrange a sleeve 71, which is feathered to' the shaft 8, and whichhas an extended portion I-Ience any movement of the member 38 causes thecorresponding movement of the gear 17.

- It is desirable to provide means which allows the storing ofconsiderable energy before the member 38 can be shifted so that it willmove very rapidly when released, and means which also serve to preventac cidental movement of the gear 17. For this purpose a device 31 may beemployed which has notches 32 33, 3i and 35 to cooperate with thelatching portion 39 of the member 38. The notches are quite shallow andwhen the spring L5 is pnt under a predetermined compression, it issufficient to release the portion 39 from the notch with which itcoacts. The cams 29 and 30 serve togmaintain the gear 17 in engagementwiththe eccentric gears 22 and 21, and obviously some means ered. inconnection with the accompanying drawings, it 13 thought that thecomplete must be provided for holding the gear 1. in Working engagementwith the concentric gears. Insome forms of my invention this meansconsists of means whlch constantly ride on concentric cams arranged onthe shaft alternately spaced with'ecoentric cams. I have here providedunique means whereby it is possible to support the master gear inworking engagement with the concentric gears without constantly engagingrotating cams. This means may be made in different :forms and positionsin the gear casing but preferably comprises a stepped cam-like de viceadapted to support the master gear carrying means in a number ofdifferent positions; This may be accomplished i'na simple manner by abar 50 suitably mounted in the casing, and forming therein stepport-ions 51, 52 and 53 to cooperate with the end portion'39. of thegear carrying member 38. As is clearly shown. in Fig. 2, this barsupports the member 38 and thereby rigidlyholds the gear 17 in mesh withthe concentric gears of the pyramid.

In order that the operation of the"inven-- tion may be clearlyunderstood, I shall state brieflythe general movements thereof. A's:suming the parts to be positioned, as shown in Fig. 1 of the drawings,and that itis de sired to-shift-the gear 17 from engagement with theconcentric gear 20 to engagement with the concentric gear. 19, the'operator moves the lever 49 ina direction to move-the rod36 from left toright, thereby compressing the spring 45 to apply a force tendlng tomove the member 38 to the right. 'So soon as the eccentric disk or cam29 presents its smallest diameter in alinement with the 39 of themember. 38, the forceof portien the spring 45 acts to shift themei'nberv 38 until the gear 17 alines'with the eccentric gear 22 atwhich time the end portion 39 rests upon the eccentric disk 29'. Bymeans of the eccentric cam 29 and the bell cr'ank 28 the gear 17 ismaintained in engagement with the eccentric gear 22 until the ".Ininrmum diameter thereof is reached. This movement of the member 38 by thecam 29 also raises the end portion 39 into alinemeut mid, isaccomplished in substantially the same'manner.

From the foregoing description considand master gear longitudinally, andmeans spaced from the shafts tor engaging said mechanism and therebysupporting the masanism carrying the master gear and adapted to supportthe master gear in Working en- 15 gagement with the aforesaid concentricgears, said eccentric cams coacting Wlth said master gear carryingmechanism for maintaining the master gear in engagement with saideccentric cams during the shifting op- 20 eration.

ELYQRY BEAUREGARD ROSS. Witnesses:

H. BYNE honrnnor, \Vmrncnn Dav s.

